JPH02156763A - Incoming call reply control system in isdn - Google Patents

Abstract

PURPOSE:To place priority on incoming call replies by providing a timer means counting a specific timer value in the presence of an incoming notice of a broadcast form from a network and a reply message return means returning a reply message when the timer means expires. CONSTITUTION:An incoming message reception section 11 receives an incoming message of a broadcast form from a network via an outgoing I bus and stores it in a memory circuit 12. Then a communication matching data extracting section 13 extracts only a data relating the communication matching from the data stored in the memory circuit 12. A comparison section 15 compares a data of the said communication matching with the communication matching data specific to the device of the system stored in a memory circuit 14 and generates an output signal when they are coincident. A timer section 17 generates an output signal at its expiration. Upon the receipt of a signal from the timer section 17, a reply message return section 18 generates an incoming reply message to the network, which is informed to the network via an incoming 1 bus.

Description

[Detailed Description of the Invention] [Summary] Regarding a call response control method in an integrated services digital network (ISDN), priority is given to a call response between multiple terminals connected on the same bus and having the same communication capability. The purpose is to provide an incoming call response system in ISDN that can be prioritized, and connects multiple terminals with the same communication and consistency onto the same I bus and connects them to the cable via a network termination device. In the subscriber system of the 1sDN, a timer means for measuring a unique timer value when a broadcast-type call notification is received from the network;
- A response message return means for returning a response message when the timeout of the master means is timed out is provided in each terminal to prioritize incoming call responses.

[Industrial application field]

The present invention relates to an incoming call response control method in an integrated service digital network (ISDN), and in particular, to the S/T point basic interface. This invention relates to an ISDN call response control method for controlling timing.

! With the spread of commercialized sDN services, (1) When a plurality of terminals are connected to a bus, the terminal that responds when a call arrives is the terminal that first sent a response message back to the network.

FIGS. 5 and 6 explain call control based on the recommendations of CCITT, TTC, etc., and show the case where direct dial-in, subaddress designation, etc. are not used.

FIG. 5 shows a case where the terminals connected within the subscriber system are only audio terminals. In the figure, (a) shows the time of call setup, in which terminals Tl lT2. ...For T7,
It is shown that the call setup message is sent in broadcast format. (b) shows that a call is in progress, and it is shown that all terminals are in a call state at the same time. (C) shows a response and response confirmation, and the network first responds to the terminal T that returned the response message.
2, a response confirmation message ■ is returned to the terminal, and a release completion message ■ is returned to the other terminals, thereby setting the call state to an empty state.

FIG. 6 shows a terminal T connected within the subscriber system.

T2. ...The case where T7 is a data terminal having the same communication consistency is shown. In the same figure, (al) indicates call setup, and each terminal simultaneously returns a response message to the network. (C) indicates a response confirmation message and a release completion message, and the network first sends the response message. It is shown that a response confirmation message is sent back to the terminal T7 that returned the call, and a release completion message is sent back to the other terminals to set the call state to an empty state.

In this way, in the conventional call response control method in the TSDN network, the subscriber cannot specify which terminal will respond, so the subscriber can set priorities among the terminals in advance and select the terminal that receives the call. A method is needed to manage this.

In this case, when the types of calls are different (e.g. data communication, FAX, voice, etc.), whether the terminal can judge whether to respond to the incoming call as ready or not, or whether it can respond to the same type of call. This method cannot be applied to responses.

Therefore, it is desired to be able to prioritize calls in response to a plurality of terminals having the same communication consistency on the I bus.

[Conventional technology]

Conventionally, in the ISDN subscriber system, in the case of a point-multipoint configuration in which multiple terminals were connected on the same bus, the terminals made a judgment to confirm the possibility of communication in response to an incoming call message from the network. , If confirmation is obtained, a response message will be sent back. In this case, when response messages are returned from multiple terminals, the network side preferentially handles the terminal that responded first, and this terminal becomes the receiving terminal.

Furthermore, by adding a subaddress to the call setting message, the calling party can specify the terminal receiving the call, but if the terminal in question cannot respond due to a malfunction or the like, the call will not be answered and will be invalid.

[Problem to be solved by the invention]

In the former conventional method, which gives priority to the terminal that responds first among multiple terminals, terminals with the same communication possibility check items are
When multiple terminals are connected on a bus, it is not possible to predefine which terminal on one bus will receive an incoming call.

In addition, in the latter conventional method of attaching a subaddress to a call setting message, if the terminal does not respond due to a failure or the like, it is necessary to take measures such as changing the subaddress and making a call again.

The present invention is an attempt to solve the problems of the prior art, and is to prioritize incoming call responses among a plurality of terminals connected on the same I bus and having the same communication possibility. The purpose of the present invention is to provide an incoming call response control system in ISDN that enables the following.

[Means to try to solve the problem]

As shown in the basic configuration of FIG. 1, the present invention is an ISDN subscriber that connects a plurality of terminals having the same communication integrity onto the same I-bus and connects to the network via a network termination device. In the system, each terminal is provided with a timer means 16°I7 and a response message return means 18 to prioritize incoming call responses.

The timer means 16 and 17 measure a unique timer value when there is a broadcast-type call notification from the network.

The response message return means 18 includes the timer section means 16.
17, a timeout response message is sent back.

In this step, a timer value unique to each terminal stored in advance in the memory circuit 16 is counted. When the timer section 17 times out, the response message return section 18 returns the response message to the network.

In this case, the timer value of each terminal is determined to be shorter as the priority level of the terminal is higher, so that the terminal with a higher priority level returns a response message as soon as possible in response to an incoming call notification.

On the other hand, the network controls the terminal that responds first to receive the call.

Therefore, according to the present invention, when a plurality of terminals having the same communication consistency are connected on the same bus, it is possible to prioritize the terminals that respond.

[For production]

At each subscriber terminal of 15ON, which connects multiple terminals with the same communication integrity onto the same I bus and connects to the network via a network termination device, the network receives a broadcast format 〇 call notification. When the timer section 17 [Embodiment] Fig. 2 shows the configuration of an embodiment of the present invention, it shows an example of the circuit configuration for incoming call response control provided in each terminal. .

In FIG. 2, 11 is an incoming message receiving unit;
Broadcast format 0 incoming call message from the network! The first memory circuit 1 receives the message via the bus and stores the received message in the first memory circuit 1.
Store in 2. Reference numeral 13 denotes a communication consistency data retrieval unit, which extracts only data related to communication consistency from the data stored in the memory circuit 12. Reference numeral 14 denotes a second memory circuit, which extracts only data related to communication consistency from the data stored in the memory circuit 12. Gender data is stored. Here, communication consistency is determined by communication conditions and protocols.

The comparison unit 15 stores the communication consistency data extracted by the communication consistency data extraction unit 13 in the memory circuit 14 . It compares the communication consistency data unique to the device, and generates an output signal when it fails. A third memory circuit 16 stores a preset timer value. When the timer section 17 receives the signal from the comparison section 15, it is set to the timer value stored in the memory circuit 16, starts counting time, and generates a timeout output signal. 18 is a response message return section, which is a timer section 1.
When receiving the signal from 7, it generates an incoming call response message to the network, and this message is notified to the network via the uplink bus.

FIG. 3 is a flowchart showing the operation within the terminal according to the method of the present invention.

In the idle state, when a call setting message is received from the rope (step S1), the call enters the incoming state, and the possibility of communication is then checked (step s2).

The terminal is compared with the communication integrity data set inside the terminal, and if a -defeat is not obtained, it becomes an empty state, but if they match, it is checked whether the waiting timer value T0 is specified (step s3 ), if specified, set To in the timer, cut, and wait for timeout (step s4)
After the timeout, the response message is sent back to the network (step s5), and the incoming call reception state is established. If the timer incoming call T0 is not specified, step s5 is immediately executed, and then the incoming call acceptance state is entered.

FIG. 4 shows an example of the connection configuration between each terminal and cable within the subscriber system and the timing of sending and receiving messages, where (a) shows the connection configuration within the subscriber system, and (b)
indicates the message transmission/reception timing within the subscriber system at the time of incoming call.

In Figure 4 (al), the terminals connected to the same I bus (I+aZ+...ram) support the same communication conditions and protocols, and the CR
The data terminals include a data terminal having a T display device, a keyboard, and a small-capacity external storage device, and a data terminal having a CRT display device, a keyboard, a large-capacity external storage device, and peripheral devices such as a plasma printer and an optical disk device. N
TI is a network termination device that terminates layer I of the subscriber system, and connects the bus and the network.

Each terminal aI+ a! +...tall is the response return waiting timer value T, respectively. It'rO! ,...+
'roe, and when receiving a call setup message from the network, response al'+response a2. . . . sends the response a7 back to the network.

4) shows the timing of sending and receiving messages within the subscriber system when a call is received. Upon receiving the call setup message from the network, each terminal sets its own timer value T. I
t Toz+ . . . A response message is sent back to the network in response to T, . At this time, each timer value is To, <T. 2
... Set it to To7, for example, TO, = 0 seconds To! = 1 second To, , = 2 seconds, when each terminal returns a response message when a call is received, it takes the time equal to each timer value so that the communication consistency is the same terminal al+ a2+..., In case a, the priority for responding when a call arrives is set to terminal al + terminal a.
2+..., each terminal aI in order to order terminal a7
+ a2+ ..., response return waiting timer value T of a7
. In It'roz,...,'rapt, T
. ,<T. 2...Ton, so when receiving a call notification message from the network, the order in which the terminals respond is terminal al+terminal a2+terminal a7 according to the priority order.

The network allocates the call to the first terminal that responds, so
A response confirmation message is sent back to terminal a, and the incoming call is accepted at terminal a. In this case, if terminal a is out of order or unable to return a response, response a2 will reach the network first, and terminal az
The incoming call is accepted at the terminal.

〔Effect of the invention〕

As explained above, according to the present invention, when a call is received, terminals connected to the same I-bus that support the same communication conditions and protocols can accept or reject the incoming call according to a predetermined priority order. will be held. Therefore, in the system of the present invention, subscribers can arbitrarily set the priority order in which calls are accepted by each terminal.

In addition, if an incoming call cannot be accepted by a higher priority terminal, the next higher priority terminal can accept the call, so the caller can, for example, change the subaddress and make the call again. You can avoid the hassle of doing so.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a flowchart showing the operation inside the terminal in the method of the present invention, and FIG. The connection configuration between each terminal and the network within the subscriber system,
Figure 5 shows the timing of sending and receiving messages within the subscriber system when a call is received. Figure 5 is a diagram showing call control when the terminals in the subscriber system are only voice terminals. Figure 6 is the timing diagram within the subscriber system. FIG. 3 is a diagram illustrating incoming call control in the case where the terminals are data terminals having the same communication consistency. 11... Incoming message receiving unit 12.14.16... Memory circuit 13... Communication integrity data extraction unit 15... Comparison unit 17... Timer unit 18... Response message return unit Figure 1 (a) illustrating the basic structure of the invention Figure 1 (a) Figure 9 (b) illustrating the connection configuration of each terminal and the timing of sending and receiving messages and messages Figure 4 A flowchart showing the operation within the terminal Figure 3- [Ward+++j'', K (a) (b') (C) T1~Tn・-・Voice-based NTI・--1Call t4AH Figure 5 explains the incoming call response when only the voice system terminal is installed. figure

Claims (1)

[Scope of Claims] In an ISDN subscriber system in which a plurality of terminals having the same communication integrity are connected to the same I bus and connected to the network via a network termination device, an incoming call notification in broadcast format from the network is provided. Each terminal is provided with a timer means (16, 17) that measures a unique timer value when the timer has occurred, and a response message return means (18) that returns a response message when the timer means (16, 17) times out. An incoming call response control method in ISDN characterized by prioritizing incoming call responses.